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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities: |  |  |
Net income (loss) | $ (10,937) | $ 8,779 | $ (4,335)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
Amortization of intangibles | 29,204 | 30,420 | 17,425
Depreciation | 15,195 | 13,867 | 9,990
Stock-based compensation | 18,926 | 20,913 | 15,539
Net (gain) loss on disposal of fixed assets | (36) | 671 | 162
Deferred income taxes | (4,969) | (361) | (1,461)
Provision for doubtful accounts and sales returns | 3,602 | 3,235 | 2,589
Provision for excess and obsolete inventories | 3,377 | 3,936 | 4,153
Excess tax benefits from stock-based compensation | (121) | (1,955) | (271)
Other non-cash adjustments, net | 1,006 | 801 | 1,529
Changes in assets and liabilities, net of effect of acquisitions: |  |  |
Accounts receivable | 20,368 | (11,477) | (22,333)
Inventories | 3,003 | (16,588) | (16,132)
Prepaid expenses and other assets | (2,684) | 7,924 | (5,445)
Accounts payable | (5,201) | 4,750 | (3,080)
Deferred revenue | 1,334 | (13,470) | 5,086
Income taxes payable | 1,535 | (6,843) | 11,017
Accrued excess facility costs | (1,724) | (327) | (2,412)
Accrued and other liabilities | (1,065) | 902 | 5,545
Net cash provided by operating activities | 70,813 | 45,177 | 17,566
Cash flows from investing activities: |  |  |
Purchases of investments | (133,778) | (107,544) | (51,457)
Proceeds from maturities of investments | 57,484 | 28,733 | 80,961
Proceeds from sales of investments | 41,354 | 30,999 | 63,269
Acquisition of property and equipment | (12,609) | (17,269) | (35,624)
Acquisition of Omneon, net of cash received |  |  | (153,254)
Other acquisitions |  | (250) | (250)
Net cash used in investing activities | (47,549) | (65,331) | (96,355)
Cash flows from financing activities: |  |  |
Proceeds from lease financing liability |  |  | 18,833
Proceeds from issuance of common stock, net | 4,819 | 12,701 | 3,859
Repurchase of common stock | (22,639) |  |
Excess tax benefits from stock-based compensation | 121 | 1,955 | 271
Net cash provided by (used in) financing activities | (17,699) | 14,656 | 22,963
Effect of exchange rate changes on cash and cash equivalents | 122 | (52) | (118)
Net increase (decrease) in cash and cash equivalents | 5,687 | (5,550) | (55,944)
Cash and cash equivalents at beginning of period | 90,983 | 96,533 | 152,477
Cash and cash equivalents at end of period | 96,670 | 90,983 | 96,533
Supplemental disclosures of cash flow information: |  |  |
Income tax payments, net | 5,051 | 7,597 | 1,427
Acquisition of Omneon [Member] |  |  |
Non-cash investing and financing activities: |  |  |
Issuance of restricted common stock for Omneon acquisition |  |  | 95,938
Fair value of vested portion of stock options and restricted stock units assumed in connection with the Omneon acquisition |  |  | $ 2,125

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- Definition Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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